Google uses simplified characters, but the picture is definitely traditional.
Characters are pronounced differently in different dialects, which is why I suspect chek pia is Hokkien.
Where are most of the Hua Hin Chinese originally descended from?

If you mean those from the Chaoshan region, that's where my other half's' family originate from. But she say's the Thai Chinese are from all over China. Hell of a coincidence, as we were just discussing this earlier and my reference to Bangkok was down to the fact that's where her family still live, with the exception of her parents and siblings, as years ago, her father, who arrived in Thailand at the age of 10, left Bkk to manage a new factory the company he then worked for were opening in Khon Kaen.

That is naturally true. However, Chinese tend to move to areas where there are people from the same areas as they are from. So the Tae Chiew are the biggest group in Bangkok.

Teochew and Hokkien[edit]

The Teochews mainly settled near the Chao Phraya River in Bangkok. Many of them worked in government, while others were involved in trade. During the reign of King Taksin, some influential Teochew traders were granted certain privileges. These prominent traders were called "royal Chinese" (Jin-luang or จีนหลวง in Thai).

The Hokkiens constitute the largest dialect group among the Chinese in Songkhla, Satun, and Phuket.

Hakka[edit]

Hakkas are mainly concentrated in Chiang Mai, Phuket, and central western provinces. The Hakka own many private banks in Thailand, notably Kasikorn Bank.